Title (en)

SCREW PUMP

Publication

EP 0420191 A3 19911106 (EN)

Application

EP 90118473 A 19900926

Priority

• JP 17166790 A 19900629
• JP 25133389 A 19890926

Abstract (en)

[origin: EP0420191A2] A screw pump (2) for feeding highly viscous material such as mixed concrete and the like. Plural projections (4a) engage the helical screw of the screw pumps to facilitating removal of the material such as gravel caught in the screw pump. Further for preventing excessive force from being exerted on the screw because of material caught in the screw pump, a spring is interposed between partitioning plates (5) and hydraulic cylinders (cy) or crank mechanisms. Further, to make the position of the holder (16) for the partitioning plate (5) stable, plural rollers are provided above the holders.

IPC 1-7

F04C 13/00; F04C 3/00; B28B 3/22

IPC 8 full level

B28B 3/22 (2006.01); B30B 11/24 (2006.01); F04C 3/04 (2006.01); F04C 13/00 (2006.01)

CPC (source: EP US)

B28B 3/22 (2013.01 - EP US); B30B 11/248 (2013.01 - EP US); F04C 3/04 (2013.01 - EP US); F04C 13/002 (2013.01 - EP US)

Citation (search report)

• [Y] DE 674436 C 19390415 - ANTON DIETZ DR
• [YD] FR 2600378 A1 19871224 - HAYASHI SEIKO KK [JP]
• [Y] US 2552930 A 19510515 - BOOTH JOHN F, et al
• [A] FR 1002133 A 19520303 - POMPES NOE L
• [A] DE 3408967 A1 19850912 - RINDERLE KARL
• [A] DE 1804314 A1 19690703 - HELIX DEVICES PTY LTD, et al

Designated contracting state (EPC)

DE FR GB

DOCDB simple family (publication)

EP 0420191 A2 19910403; EP 0420191 A3 19911106; US 5102294 A 19920407

DOCDB simple family (application)

EP 90118473 A 19900926; US 58649890 A 19900921